Data capture device and method thereof

摘要

A data capture device including a signal processing unit, a frequency locked circuit and a match circuit is provided. The signal processing unit converts a radio frequency signal to a return-to-zero signal. The frequency locked circuit estimates a minimum interval length by the return-to-zero signal in a plurality of detecting periods, and generates an enable signal according to the minimum interval length and the return-to-zero signal. The frequency locked circuit determines whether to calibrate the enable signal according to a distribution of a plurality of enable pulses in the enable signal to generate a sampling signal. The match circuit samples the return-to-zero signal by the sampling signal and generates a synchronization signal according to a sampling result. The match circuit generates a composite synchronization signal by a virtual signal and the synchronization signal, and captures a plurality of row data from the return-to-zero signal according to the composite synchronization signal.

主权项

1. A data capture device, comprising:
a signal processing unit, converting a radio frequency (RF) signal to a return-to-zero signal; a frequency locked circuit, estimating a minimum interval length by the return-to-zero signal in a plurality of detecting periods, generating an enable signal according to the minimum interval length and the return-to-zero signal and determining whether to calibrate the enable signal according to a distribution of a plurality of enable pulses in the enable signal so as to generate a sampling signal; and a match circuit, sampling the return-to-zero signal by the sampling signal, generating a synchronization signal according to a sampling result, generating a composite synchronization signal by a virtual signal and the synchronization signal and capturing a plurality of row data from the return-to-zero signal according to the composite synchronization signal.